Counterbalance



July 15, 1930.- L. F. FRASR 1,770,880

COUNTERBALANCE Filed Aug. 3, 1929 3 Sheets-Sheet l m nl 2l 22 Q3 ATTORNEY July 15, 1930. L. F. FASER 1,770,880

COUNTERBALANCE Filed Aug. 5, 1929 5 ysheets-sheet 2 /vj. 7249 2 la a @I6-1772]* ll' 2 Y 1 auf, l

/Qnln Z. I.' Fraser I3 I lNvENToR July 15, 1930. L. F, FRASER 1,770,880

COUNTERBALANGE Filed Aug; 3, 1929 3 Sheets-Sheet 3 INVENTOR ATTORNEY Patented July 15, leso "Lovins 'FAIRY FRASER, or' SAND SPRINGS, OKLAHOMA COUNTERBALANCE y'Application filed August 3, 1929. Serial N0. 383,358.

This invention relates to a combined crank and counterbalance for a shaft of machinery used in oil fields, the general object of the invention being to provide means whereby the crankcan be readily loosened from the shaft so that it will not turn with the shaft and to provide means whereby the weighted part can be added to or decreased, as desired.

This invention also consists in certain other features of construction and in the combination and arrangement ofV the several parts, to be hereinafter fully described, illustrated in the accompanying drawings and specifically pointed out in the appended claim.

In describing the invention in detail, reference will be had to the accompanying drawings wherein like characters denote like or corresponding parts throughout the,J several views, and in which Figure 1 is an end view of the inventio applied to the end of a shaft. l Figure 2 is a side view of Figure 1. Figure 3 is a section on line 3-3 of Fig 2,5 ure 1. ,o A

Figure 4 is a view similar to Figure 1, but

showing parts in section and with the crank loosened from the shaft. A

Figure 5 is an edge view of one of' the 3o weight members.

' Figure 6 is a top plan View of said member. Figure 7 is a view of the split member used for holding the crank pin in oneof the holes of the crank. L

Figure 8 is a sectional view. through the weighted part of the crank, showing a,modification. l

Figure 9 is a view showing another modification.

Figure 10 is a section on line Figure 9.

Figure 11 is a section on line 11-11 of Figure 9.A

Figure 12 is a 45 modification.

Figure 13 is an edge view of the lower part ofFigure12.

Figure 14 is a section on line 11i-14 of Figure 12.

'In these drawings, the numeral 1 indicates view showing still another4 a shaft of a machine used in the oil lields or any other desired place and 2 indicates a hub which is keyed to the end of said shaft. The numeral 3 indicates a crank arm which has a semi-circular bearing 4 at one end thereof for engaging a part of the hub, the ,l other part of the bearing being shown at 5, the two bearing part-s being connected together by the bolts 6. The hub is formed with an annular-groove 7 for receiving the' bearing parts. A part of the bottom of .the groove is formed with a notch or recess 8 to receive a projection 9 formed on the central portion of the bearing part 4, so that the crank arm is firmly connected with the hub when the nuts on the bolts 6 are tightened.` A bolt 10 passes through a hole formed in the center of the bearing part 5 and engages` a recess 11 formed in the hub so that this part is firmly held to the hub when the bolt 10 is screwed home.

The arm is provided with a plurality of tapered holes 12, any one of which is adapted to receive4 the tapered end 13 of the crank pin 14. 'A split tapered sleeve 15 is adapted l to` be placed over thetap'ered part 13 of the pin and to fitin one of the tapered. holes and the extremity of the pin is provided with a threaded reduced part 16 for receiving a nut 17 for holdingthe pin and sleeve in position. By'having a plurality of the holes 13, the pin can be fastened to any desired part of the-arm. The outer end ofthe arm is of arc shape and is formed with` the wings 18 at its side edgesand a number of arc-shaped weight members A19 is adapted to be fastened to the curved end of the arm by the bolts 20 which pass through holes formed in themembers 19 and through holes formed in the wings 18. These members are placed one upon another, with the inner one bearing against the curved end of the arm and the outer member is formed with the shoulders 21 to form seats `for the bolt heads.V Projections 22 are formed on the inner faces of all the members 19, except the first one, and the projections on one member fit in sockets 23 formed on the next member.

From the foregoing it will be seen that when it is not desired to use the crank, the

'50- the ends of the casing and these bent-up ends crank can be loosened from the hub so that it will not rotate with the shaft by loosening the nuts on the bolts 6 and partly unscrewing the bolt 10, as shown in Figure 4, so that the crank will be held out of engagement with the hub and will, therefore, not rotate 'with the hub. This is useful in pulling rods,

for instance. It will also be seen that the weight members can be readily detached from the crank when it is not desired to use such weight members. For instance, when the machine is used for drilling, the crank is used without the Weight members. These members are used when the machine is used for pumping, as they act to counterbalance the load on the other end of the beam', this not being shown in the drawings.

In the modification shown in Figure 8, the wings 18 are formed with slots 24 instead of holes, and the weight members are formed with the slots 25 instead of holes, so that the bolts 20 can be swung into the inclined position shown in dotted'lines in Figure 8, after the nuts are loosened, to disconnect the .weight members from the crank arm. -f

In 'the modiication shown in Figures 9, 10 and 11, the U bolts 20 are used instead'of straight bolts for connecting the weight members to the crank arms, these U bolts embracing the side edges of the weight members and the wings and the weight members and wings are formed with semi-circular notches 26 to receive portions of the bolts. The bights of' of the crank arm, the sides of this casing be-v ing open, with its outer part of arc shape and its ends sloping outwardly. The weight members 19" are adapted to be placed in the casing and held therein by the bolts 29 which pass through the outer part-df-tlie casing and through the Weight members. These bolts also pass through a follower plate 30 which is formed of two`sections 30', Aone Qi which contains a tongue 31 fitting in a notch 32 formed in the other section. The oiter end of each sectionis bent to engage are fastened to the ends of the casing by the bolts 33 which pass through elongated slots 34.- in the ends of the casing, so that the plate 30 can be adjusted in the .casing to suit the number of weight members placed therein. These weight members are preferably of lead.

As will be seen, in all the forms of the intion that the advantages and novel features of the invention will be readily apparent.

It is to be understood that changes may be made in the construction'and in the combination and arrangement of the several parts, provided that such changes fall within the scope of the appended claim.

What I claim is In combination with a shaft of an apparatus, a crank arm connected with one end of the shaft and having an enlarged free end, a plurality of plate-like weight members, means for detachably connecting the weight members to said free end of the arm, each weight member being of arc shape and the weight members resting one upon another.

In testimony whereof I aiiix my signature.

LOVIAS FAIRY FRASER.

ventiou, the number of weight members used I can be easily and quickly changed so -that the crankl arm can be given the desired weight or the weights can be entirely removed, when necessary. v

It is thought from the foregoing descrip- SII 

